Finding the Fourth Proportional to 13,315.80, 18,372.72 and 7,723.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,315.80 : 18,372.72 = 7,723.56 : x
2. Step 2: Convert to fraction form
   13,315.80/18,372.72 = 7,723.56/x
3. Step 3: Cross multiply
   13,315.80x = 18,372.72 × 7,723.56
4. Step 4: Simplify right side
   13,315.80x = 141,902,805.28
5. Step 5: Solve for x
   x = 141,902,805.28/13,315.80
6. Step 6: Final answer
   x = 10,656.72